WO2020218217A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2020218217A1
WO2020218217A1 PCT/JP2020/016960 JP2020016960W WO2020218217A1 WO 2020218217 A1 WO2020218217 A1 WO 2020218217A1 JP 2020016960 W JP2020016960 W JP 2020016960W WO 2020218217 A1 WO2020218217 A1 WO 2020218217A1
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Prior art keywords
current collecting
electrode
spacer
secondary battery
electrode assembly
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PCT/JP2020/016960
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English (en)
Japanese (ja)
Inventor
直人 秋月
大塚　正博
守伯 尾崎
Original Assignee
株式会社村田製作所
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Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to CN202080030896.1A priority Critical patent/CN113711406A/zh
Priority to JP2021516089A priority patent/JP7215570B2/ja
Publication of WO2020218217A1 publication Critical patent/WO2020218217A1/fr
Priority to US17/506,792 priority patent/US20220045407A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/477—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a secondary battery.
  • the secondary battery is a so-called storage battery, it can be repeatedly charged and discharged, and is used for various purposes.
  • secondary batteries are used in mobile devices such as mobile phones, smartphones and laptop computers.
  • the secondary battery generally has a structure in which the electrode assembly is housed inside the exterior. That is, in the secondary battery, the electrode body is housed in the outer body that becomes the case.
  • the inventor of the present application noticed that there was a problem to be overcome with the conventional secondary battery, and found that it was necessary to take measures for that purpose. Specifically, the inventor of the present application has found that there are the following problems.
  • a secondary battery generally has a structure in which an electrode assembly including a positive electrode, a negative electrode, and a separator arranged between them, and an electrolyte are enclosed in an outer body.
  • the electrode assembly has positive and negative electrode current collecting tabs protruding from the same end face of the electrode assembly. Further, a spacer for insulation between the members is provided between the electrode assembly and the exterior body (for example, Patent Document 1).
  • the current collecting tab 6 protrudes from the end face 200'of the electrode assembly 200.
  • a spacer 4 is provided in the vicinity of the end face 200'for insulation between the electrode assembly 200 and the exterior body 300.
  • the spacer 4 is provided with an opening 8 for passing the current collecting tab 6.
  • the current collecting tab 6 crosses the opening 8 of the spacer 4 and is positioned between the spacer 4 and the exterior body 300.
  • the electrode assembly 200 may collide with the spacer 4 and cause a short circuit.
  • the present invention has been made in view of such a problem. That is, a main object of the present invention is to provide a secondary battery that is more suitable in terms of preventing short circuits.
  • the present invention is an electrode assembly including a positive electrode, a negative electrode, and a separator arranged between the positive electrode and the negative electrode, and a secondary battery in which an electrolyte is sealed in an outer body, and is between the electrode assembly and the outer body.
  • the electrode assembly comprises a spacer to be positioned, the electrode assembly has positive and negative electrode current collecting tabs protruding from the same end face in the electrode assembly, and the spacer has a current collecting tab protruding in the electrode assembly.
  • the present invention relates to a secondary battery which is positioned between an end face and an exterior body and has a bent shape at least one of a positive electrode and a negative electrode current collecting tab between the electrode assembly and the spacer.
  • the secondary battery according to the present invention has a more suitable structure in terms of preventing short circuits.
  • At least one of the positive electrode and negative electrode current collecting tabs has a bent shape between the electrode assembly and the spacer.
  • a current collecting tab having a bent shape is positioned in the space between the electrode assembly and the spacer.
  • FIG. 1A and 1B show a schematic cross-sectional view of the electrode assembly (FIG. 1A: non-winding planar laminated battery, FIG. 1B: wound battery).
  • FIG. 2 shows a schematic perspective development view of the secondary battery according to the present invention.
  • FIG. 3 shows a schematic perspective view of the secondary battery according to the present invention.
  • FIG. 4 shows a schematic cross-sectional view of the secondary battery along the line aa'in FIG.
  • FIG. 5 shows a schematic cross-sectional view of the secondary battery along the line bb'in
  • FIG. 6A to 6F show schematic views of various aspects of the current collecting tab according to the present invention.
  • FIG. 7 shows a schematic cross-sectional view of the secondary battery along the cc'line in FIG. FIG.
  • FIG. 8 shows a schematic perspective view for explaining the constituent members of the electrode assembly constituting the secondary battery according to the present invention.
  • 9A and 9B show schematic perspective views for explaining a method of assembling the electrodes constituting the secondary battery according to the present invention.
  • FIG. 10 shows a schematic cross-sectional view of a secondary battery according to the prior art.
  • the direction of "thickness” described directly or indirectly in the present specification is based on the stacking direction of the electrode materials constituting the secondary battery.
  • the direction of "thickness” corresponds to the plate thickness direction of such a secondary battery.
  • the "cross-sectional view” is based on a virtual cross-section of an object obtained by cutting along the thickness direction of the secondary battery. For example, based on a cross section cut along a surface formed by a thickness direction based on the stacking direction of the electrode layers constituting the secondary battery and a longitudinal direction in which the electrode layer extends in the direction in which the electrode terminals are located. ing. In short, it is based on the cross-sectional shape of the secondary battery shown in FIG.
  • the present invention provides a secondary battery.
  • the term “secondary battery” refers to a battery that can be repeatedly charged and discharged.
  • the “secondary battery” is not overly bound by its name and may also include an electrochemical device such as a "storage device”.
  • the secondary battery according to the present invention includes an electrode assembly having an electrode building block including a positive electrode, a negative electrode, and a separator.
  • the electrode assembly 200 is illustrated in FIGS. 1A and 1B.
  • the positive electrode 1 and the negative electrode 2 are stacked with each other via the separator 3 to form an electrode constituent unit 100.
  • At least one or more of these electrode constituent units are laminated to form an electrode assembly (see FIG. 1A), or the electrode constituent units are wound to form an electrode assembly (see FIG. 1B). ..
  • an electrode assembly is encapsulated in the exterior together with an electrolyte (eg, a non-aqueous electrolyte).
  • the positive electrode is composed of at least a positive electrode material layer and a positive electrode current collector (for example, a positive electrode current collector forming a layer form).
  • a positive electrode material layer is provided on at least one surface of the positive electrode current collector, and the positive electrode material layer contains a positive electrode active material as an electrode active material.
  • each of the plurality of positive electrodes in the electrode assembly may be provided with positive electrode material layers on both sides of the positive electrode current collector, or may be provided with positive electrode material layers on only one side of the positive electrode current collector. .. From the viewpoint of further increasing the capacity of the secondary battery, it is preferable that the positive electrode is provided with positive electrode material layers on both sides of the positive electrode current collector.
  • the negative electrode is composed of at least a negative electrode material layer and a negative electrode current collector (for example, a negative electrode current collector forming a layer form).
  • a negative electrode material layer is provided on at least one surface of the negative electrode current collector, and the negative electrode material layer contains a negative electrode active material as an electrode active material.
  • each of the plurality of negative electrodes in the electrode assembly may be provided with negative electrode material layers on both sides of the negative electrode current collector, or may be provided with negative electrode material layers on only one side of the negative electrode current collector. .. From the viewpoint of further increasing the capacity of the secondary battery, it is preferable that the negative electrode is provided with negative electrode material layers on both sides of the negative electrode current collector.
  • the electrode active materials contained in the positive electrode and the negative electrode are substances that are directly involved in the transfer of electrons in the secondary battery, and are the main substances of the positive and negative electrodes that are responsible for charge / discharge, that is, the battery reaction. is there. More specifically, ions are brought to the electrolyte due to the "positive electrode active material contained in the positive electrode material layer" and the "negative electrode active material contained in the negative electrode material layer", and such ions are transferred between the positive electrode and the negative electrode. The electrons are transferred and charged / discharged.
  • the positive electrode material layer and the negative electrode material layer are particularly preferably layers capable of occluding and releasing lithium ions.
  • the secondary battery according to the present invention corresponds to a so-called lithium ion battery, and the positive electrode and the negative electrode have layers capable of occluding and discharging lithium ions.
  • the positive electrode active material of the positive electrode material layer is composed of, for example, granules
  • the positive electrode material layer contains a binder for more sufficient contact between particles and shape retention.
  • a conductive auxiliary agent may be contained in the positive electrode material layer in order to facilitate the transfer of electrons that promote the battery reaction.
  • the negative electrode active material of the negative electrode material layer is composed of particles, for example, it is preferable that the negative electrode active material contains a binder for more sufficient contact between the particles and shape retention, and facilitates the transfer of electrons that promote the battery reaction.
  • a conductive auxiliary agent may be contained in the negative electrode material layer.
  • the positive electrode active material is preferably a substance that contributes to the storage and release of lithium ions. From this point of view, the positive electrode active material is preferably, for example, a lithium-containing composite oxide. More specifically, the positive electrode active material may be a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese and iron. That is, in the positive electrode material layer of the secondary battery according to the present embodiment, such a lithium transition metal composite oxide is preferably contained as the positive electrode active material.
  • the positive electrode active material is lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium iron phosphate, or a part of the transition metal thereof replaced with another metal. Although such a positive electrode active material may be contained as a single species, two or more species may be contained in combination.
  • the binder that can be contained in the positive electrode material layer is not particularly limited, but is not particularly limited, but is limited to polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer and polytetrafluoroethylene. At least one species selected from the group consisting of the above can be mentioned.
  • the conductive auxiliary agent that can be contained in the positive electrode material layer is not particularly limited, but is limited to carbon black such as thermal black, furnace black, channel black, ketjen black and acetylene black, graphite, carbon nanotubes, and vapor phase growth.
  • At least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives can be mentioned.
  • the binder of the positive electrode material layer is polyvinylidene fluoride
  • the conductive aid of the positive electrode material layer is carbon black
  • the binder and conductive aid of the positive electrode material layer is a combination of polyvinylidene fluoride and carbon black.
  • the thickness dimension of the positive electrode material layer is not particularly limited, but is preferably 1 ⁇ m or more and 300 ⁇ m or less, for example, 5 ⁇ m or more and 200 ⁇ m or less.
  • the thickness dimension of the positive electrode material layer is the thickness inside the secondary battery, and the average value of the measured values at any 10 points is used.
  • the negative electrode active material is preferably a substance that contributes to the storage and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, lithium alloys, and the like.
  • Examples of various carbon materials for the negative electrode active material include graphite (for example, natural graphite and / or artificial graphite), hard carbon, soft carbon, and / or diamond-like carbon.
  • graphite is preferable because it has high electron conductivity and excellent adhesion to a negative electrode current collector.
  • Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide and the like.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium, for example, Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn, It is a binary, ternary or higher alloy of a metal such as La and lithium. Such oxides may be amorphous in their structural form. This is because deterioration due to non-uniformity such as grain boundaries or defects is less likely to occur.
  • the negative electrode active material of the negative electrode material layer is artificial graphite.
  • the binder that can be contained in the negative electrode material layer is not particularly limited, but is at least one selected from the group consisting of styrene-butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide-based resin, and polyamide-imide-based resin. Can be mentioned.
  • the binder contained in the negative electrode material layer is styrene-butadiene rubber.
  • the conductive auxiliary agent that can be contained in the negative electrode material layer is not particularly limited, but is limited to carbon black such as thermal black, furnace black, channel black, ketjen black and acetylene black, graphite, carbon nanotubes, and vapor phase growth.
  • the negative electrode material layer may contain a component derived from a thickener component (for example, carboxylmethyl cellulose) used at the time of manufacturing the battery.
  • a thickener component for example, carboxylmethyl cellulose
  • the negative electrode active material and binder in the negative electrode material layer are a combination of artificial graphite and styrene-butadiene rubber.
  • the thickness dimension of the negative electrode material layer is not particularly limited, but is preferably 1 ⁇ m or more and 300 ⁇ m or less, for example, 5 ⁇ m or more and 200 ⁇ m or less.
  • the thickness dimension of the negative electrode material layer is the thickness inside the secondary battery, and the average value of the measured values at any 10 points is used.
  • the positive electrode current collector and the negative electrode current collector used for the positive electrode and the negative electrode are members that contribute to collecting and supplying electrons generated by the active material due to the battery reaction.
  • a current collector may be a sheet-like metal member and may have a perforated or perforated form.
  • the current collector may be metal foil, punching metal, mesh or expanded metal.
  • the positive electrode current collector used for the positive electrode is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and is, for example, an aluminum foil.
  • the negative electrode current collector used for the negative electrode is preferably one made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel and the like, and is, for example, a copper foil.
  • the separator is a member provided from the viewpoint of preventing a short circuit due to contact between the positive and negative electrodes and retaining the electrolyte.
  • the separator can be said to be a member through which ions pass while preventing electronic contact between the positive electrode and the negative electrode.
  • the separator is a porous or microporous insulating member, which has a film morphology due to its small thickness.
  • a microporous polyolefin membrane may be used as the separator.
  • the microporous membrane used as the separator may contain, for example, only polyethylene (PE) or polypropylene (PP) as the polyolefin.
  • the separator may be a laminate composed of a "microporous membrane made of PE” and a "microporous membrane made of PP".
  • the surface of the separator may be covered with an inorganic particle coat layer and / or an adhesive layer or the like.
  • the surface of the separator may have adhesiveness.
  • the thickness dimension of the separator is not particularly limited, but is preferably 1 ⁇ m or more and 100 ⁇ m or less, for example, 5 ⁇ m or more and 20 ⁇ m or less.
  • the thickness dimension of the separator is the thickness inside the secondary battery (particularly the thickness between the positive electrode and the negative electrode), and the average value of the measured values at any 10 points is used.
  • an electrode assembly including a positive electrode, a negative electrode and a separator is enclosed in an outer body together with an electrolyte.
  • the electrolyte assists the movement of metal ions released from the electrodes (positive electrode / negative electrode).
  • the electrolyte may be a "non-aqueous" electrolyte such as an organic electrolyte and an organic solvent, or it may be a "water-based" electrolyte containing water.
  • the secondary battery according to the present invention is a non-aqueous electrolyte secondary battery in which an electrolyte containing a "non-aqueous" solvent and a solute is used as the electrolyte.
  • carbonates may be cyclic carbonates and / or chain carbonates.
  • the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC) and vinylene carbonate (VC).
  • PC propylene carbonate
  • EC ethylene carbonate
  • BC butylene carbonate
  • VC vinylene carbonate
  • chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC) and dipropyl carbonate (DPC).
  • non-aqueous electrolyte for example a mixture of ethylene carbonate and diethyl carbonate.
  • a Li salt such as LiPF 6 and / or LiBF 4 may be used.
  • the current collecting tab any current collecting tab used in the field of secondary batteries can be used.
  • the current collecting tab may be composed of a material in which electron transfer can be achieved, usually composed of a conductive material such as silver, gold, copper, iron, tin, platinum, aluminum, nickel, and / or stainless steel. Will be done.
  • the form of the current collecting tab is not particularly limited, and may be, for example, linear or plate-shaped.
  • the positive electrode side and negative electrode side current collecting tabs (hereinafter, also collectively referred to as “positive and negative electrode current collecting tabs”) may protrude from any surface of the electrode assembly.
  • the positive and negative electrode current collecting tabs may project from different surfaces of the electrode assembly, or may project from the same surface.
  • the positive and negative electrode current collecting tabs project from the same surface. That is, the positive electrode current collecting tab and the negative electrode current collecting tab may extend so as to project from the same end surface (that is, the same side surface) of the electrode assembly.
  • the exterior body is usually a hard case, and may consist of two members such as a main body and a lid.
  • the main body and the lid are sealed after the electrode assembly, the electrolyte and the current collecting tab, and optionally the electrode terminals and the like are housed.
  • the method for sealing the exterior body is not particularly limited, and examples thereof include a laser irradiation method.
  • any material that can form a hard case type exterior body can be used in the field of secondary batteries.
  • a material may be a conductive material in which electron transfer can be achieved, or an insulating material in which electron transfer cannot be achieved.
  • the material of the exterior body is preferably a conductive material from the viewpoint of taking out the electrodes.
  • the conductive material examples include conductive materials such as silver, gold, copper, iron, tin, platinum, aluminum, nickel and / or stainless steel.
  • Insulating materials include, for example, insulating polymer materials such as polyester (eg, polyethylene terephthalate), polyimide, polyamide, polyamideimide, and / or polyolefin (eg, polyethylene and / or polypropylene).
  • both the main body and the lid may be made of stainless steel.
  • stainless steel is an alloy steel containing chromium or chromium and nickel, and generally has a chromium content of about 10.5% or more of the total. Refers to steel. Examples of such stainless steels include martensite-based stainless steels, ferrite-based stainless steels, austenitic stainless steels, austenitic-ferritic stainless steels and / or precipitation-hardened stainless steels.
  • the dimensions of the main body and lid of the exterior body are mainly determined according to the dimensions of the electrode assembly.
  • the exterior body has a size that prevents the electrode assembly from moving inside the exterior body when the electrode assembly is housed. By preventing the electrode assembly from moving, damage to the electrode assembly due to impact or the like can be prevented, and the safety of the secondary battery can be improved.
  • the exterior body may be a flexible case such as a pouch made of a laminated film.
  • the laminated film has a structure in which at least a metal layer (for example, aluminum) and an adhesive layer (for example, polypropylene and / or polyethylene) are laminated, and additionally a protective layer (for example, nylon and / or polyamide) is used. ) May be laminated.
  • the thickness dimension (that is, the wall thickness dimension) of the exterior body is not particularly limited, but is preferably 10 ⁇ m or more and 200 ⁇ m or less, for example, 50 ⁇ m or more and 100 ⁇ m or less.
  • the thickness dimension of the exterior body the average value of the measured values at any 10 points is used.
  • the secondary battery is generally provided with an electrode terminal.
  • Such electrode terminals may be provided on at least one surface of the exterior body.
  • the electrode terminals of the positive electrode and the electrode terminals of the negative electrode may be provided on the same surface of the exterior body so as to be separated from each other.
  • the electrode terminal of the positive electrode and the electrode terminal of the negative electrode may be provided on different surfaces of the exterior body.
  • the electrode terminal of the positive electrode and the electrode terminal of the negative electrode may protrude from the same surface.
  • the electrode terminals on the positive electrode side and the negative electrode side may project from the side surface of the exterior body so as to project in a direction perpendicular to the direction in which the electrode layers are laminated.
  • the material of the electrode terminal is not particularly limited, and at least one selected from the group consisting of silver, gold, copper, iron, tin, platinum, aluminum, nickel, and stainless steel can be mentioned.
  • the electrode terminal may be composed of a single material or may be composed of a plurality of materials.
  • An electrode terminal made of a plurality of materials (hereinafter, also referred to as an “electrode terminal structure”) is composed of a rivet portion, an inner terminal, and a gasket portion.
  • the rivet portion and the inner terminal may be made of a material capable of achieving electron movement.
  • the rivet and inner terminals are each made of a conductive material such as silver, gold, copper, iron, tin, platinum, aluminum, nickel and / or stainless steel.
  • the gasket portion may be made of an insulating material.
  • the gasket portion is composed of an insulating polymer material such as polyester (eg, polyethylene terephthalate), polyimide, polyamide, polyamideimide, and / or polyolefin (eg, polyethylene and / or polypropylene).
  • the positive / negative electrode current collecting tab is electrically connected to the electrode terminal or the electrode terminal structure, and is electrically led out to the outside through the electrode terminal or the electrode terminal structure.
  • the electrode terminal structure is not particularly limited, but may be fitted and inserted into the through hole of the exterior body, for example.
  • the electrode terminal structure mainly includes a conductive rivet portion for leading the electrode to the outside, an outer gasket portion for preventing leakage of electrolyte while ensuring electrical insulation between the rivet portion and the exterior body. Includes an inner terminal to ensure electrical connection between the rivet and current collection tab, and an inner gasket to prevent electrolyte leakage while ensuring electrical insulation between the inner terminal and the exterior. It may be.
  • the positive / negative electrode current collecting tab may be connected to the electrode terminal or the electrode terminal structure. Further, the positive and negative electrode current collecting tabs may be electrically connected to the exterior body and electrically led out to the outside through the exterior body. For example, when the exterior body is a conductive hard case type exterior body, the current collecting tab may be in contact with the inside of the exterior body and electrically connected so as to be led out to the outside through the exterior body. It may be. In other words, the exterior body may be charged with a positive electrode or a negative electrode by being connected to the current collecting tab, and the current collecting tab is electrically led out from the electrode terminals provided on the exterior body. It may be.
  • the current collecting tab of one of the positive and negative electrodes is electrically connected to the electrode terminal structure, and the current collecting tab of the other electrode of the positive and negative electrodes is conductive. It is preferable that it is electrically connected to the inside of the hard case type exterior body.
  • any spacer used in the field of secondary batteries can be used.
  • the spacer is not particularly limited as long as it prevents electronic contact between the electrode assembly (particularly the electrode) and the exterior body (particularly the electrode terminal). Therefore, the spacer can also be referred to as an insulating member that prevents electronic contact between the electrode assembly and the exterior body (particularly the electrode terminals thereof).
  • the spacer may be, for example, plate-shaped as a whole.
  • Materials constituting the spacer include polyolefin (for example, polyethylene and / or polypyrropyrene), polystyrene, polyester (for example, polyethylene terephthalate and / or polybutylene terephthalate), polyvinyl chloride, acrylic polymer (for example, polymethylmethacrylate, etc.). ), And / or a polymer material such as polypropylene, and various insulating materials such as a rubber material such as nitrile rubber, urethane rubber, fluororubber and / or silicone rubber.
  • the spacer may have any form as long as contact between the electrode assembly and the exterior body can be prevented, and may have, for example, the form of a film, sheet, board or fabric (eg, non-woven fabric).
  • the secondary battery according to the present invention is a battery having an electrode assembly and an exterior body for accommodating the electrode assembly, and the form of a current collecting tab protruding from the electrode assembly and between members around the current collecting tab. It is characterized in terms of the positional relationship of.
  • the secondary battery comprises a spacer 4 located inside the exterior body 300 (310) between the electrode assembly 200 and the exterior body 300 (see FIG. 2).
  • the spacer 4 is, for example, a plate-shaped spacer, and such a spacer 4 is provided so as to partition a space between one side surface (particularly, the “end surface” described later) of the electrode assembly 200 and the exterior body 300.
  • the main surface of the spacer 4 may be sized so as to substantially cover one side surface of the electrode assembly 200.
  • the main surface of the plate-shaped spacer 4 may be substantially the same size as the end surface of one side surface of the electrode assembly 200 as a whole.
  • the secondary battery comprises a spacer 4 positioned between the end face 200'on which the current collecting tab of the electrode assembly 200 projects and the exterior body 300 (see FIG. 4).
  • the end face 200'of the electrode assembly 200 and the spacer 4 are separated from each other.
  • the spacer 4 is provided in non-contact with or away from the separator extending portion extending outside the positive electrode and the negative electrode.
  • a current collecting tab 6 having a bent shape that is, a positive electrode current collecting tab 61 and / or a negative electrode current collecting tab 62) is positioned between the electrode assembly 200 and the spacer 4 (FIGS.
  • the current collecting tab 6 extends so as to meander in the separated space between the electrode assembly and the spacer due to the bent shape.
  • the current collecting tab 6 serves as a cushioning material even when the secondary battery 400 undergoes fluctuations such as impact or heat. It works (for example, like a spring) and can prevent the electrode assembly 200 from colliding with the spacer 4. More simply, the current collector tab 6 can absorb, for example, the impact that can occur between the electrode assembly 200 and the spacer 4. Therefore, a short circuit in the electrode assembly 200 can be more preferably prevented.
  • the "bent shape" in the present disclosure refers to the form of a current collecting tab that bends greatly so as to form a convex shape in a cross-sectional view.
  • the "bent shape” refers to a form in which the current collecting tabs protruding from the electrode assembly are bent and extended so as to be folded back in a cross-sectional view.
  • the current collecting tab 6 is directed from the electrode assembly 200 toward the spacer 4 when K 3 is viewed as a starting point, and then from the spacer 4 to the electrode with a bent portion K 1 as a boundary. It is bent toward the assembly 200. Further, in the exemplary embodiment shown in FIG.
  • the current collecting tab 6 has a portion K 2 forming a bent shape bent toward the electrode assembly 200 to the spacer 4.
  • the current collecting tabs protruding from the electrode assembly extend so as to meander in the separation space between the electrode assembly and the spacer.
  • the "bent shape” in the present disclosure may include a bent shape represented by a curved shape and / or a bent shape.
  • curved as shown in K 1 and K 2 in FIG. 4, in a cross-sectional view, a to flex bay-shaped (or arcuate) (i.e. to bend substantially curved), rounded It brings about bending and includes bending.
  • Bend is to bend at an acute angle (that is, to bend substantially linearly) in a cross-sectional view. From the viewpoint of improving shock absorption, the "bent shape” is preferably curved.
  • the bent shape of the current collecting tab may be a curved shape that bends in a bow shape, whereby the current collecting tab can more preferably absorb the impact that may occur between the pole assembly and the spacer.
  • the bent shape of the portion K 1 and K 2 which forms a bent shape is a curved shape.
  • the "bent shape” in the present disclosure is a "folded shape", a “substantially U-shaped (or substantially V-shaped) shape", a “curved shape having a maximum point", or an "acute angle”. It can also be called “bending shape”.
  • the current collecting tab 6 may have at least one bent shape in the gap between the electrode assembly 200 and the spacer 4.
  • the current collecting tabs 6 are formed in plurality (for example, two) (see FIGS. 4 and 5).
  • the elasticity of the current collecting tabs 6 (for example, spring elasticity) can be further improved, and the impact that can occur between the electrode assembly 200 and the spacer 4 can be further increased. Can be absorbed.
  • the bending shape of the current collecting tab 6 is preferably 5 or less (that is, the positive electrode current collecting tab or the negative electrode current collecting tab is formed by the electrode assembly 200 and the spacer 4). It preferably has a bent portion of 2 or more and 5 or less in the gap space).
  • the current collecting tab 6 may have a portion K 0 having a bent shape so as to be convex in the thickness direction (see FIG. 6A). Further, the current collecting tab 6 may protrude from the electrode in the outermost layer of the electrode assembly 200 (see FIG. 6A). For example, the current collecting tab 6 may project outward from the outermost layer of the electrode assembly 200 in a direction orthogonal to the stacking direction of the assembly. Further, it may protrude from the electrode in the inner layer of the electrode assembly 200 (see FIG. 6B). That is, the current collecting tab 6 may protrude outward from the electrode of the non-outermost layer that does not form the outermost layer in the electrode assembly 200.
  • the current collector tab 6 projects from the electrode in the inner layer of the electrode assembly 200, it may have three bent shaped portions (ie, K 0 , K 1 and K 2 ) (see FIG. 6C). ..
  • the electrode assembly 200 may be a flat laminated electrode assembly, in which case the sub-current collecting tabs protruding from the respective electrodes may be bundled to form the current collecting tab 6 (see FIG. 6D).
  • FIG. 6D When such a plane-laminated electrode assembly 200 is used (see FIG. 1A), even if a current collecting tab 6 is provided separately from the tab for electrically connecting the electrodes in each of the positive electrode and the negative electrode. Good.
  • At least one of the positive and negative electrode current collecting tabs may have a bent shape between the electrode assembly and the spacer, and it is preferable that both the positive and negative electrode current collecting tabs have a bent shape. Since both the positive and negative current collecting tabs have a bent shape, both positive and negative current collecting tabs can be made elastic. In addition, a region for absorbing impact can be formed at different positions between the electrode assembly and the spacer. Thereby, the impact that may occur between the electrode assembly and the spacer can be more absorbed. Further, even when a shock or heat is applied to the secondary battery, the movement of the electrode assembly and the spacer (particularly, the electrode assembly rotates in the plane circumferential direction inside the exterior body) is more preferably prevented. be able to.
  • the positive electrode current collecting tab 61 has a bent shape between the electrode assembly 200 and the spacer 4 (see FIG. 4). Further, the negative electrode current collecting tab 62 has a bent shape between the electrode assembly 200 and the spacer 4 (see FIG. 5). That is, both the positive electrode current collecting tab 61 and the negative electrode current collecting tab 62 each have a bent shape in the “separated space” in which the same spacer is involved. As a result, it is possible to more effectively absorb the impact that may occur between the electrode assembly 200 and the spacer 4 while taking into consideration the compactification of the secondary battery.
  • the bent portion of the current collector tab is in contact with the spacer. That is, the convex portion of the current collecting tab is in contact with the main surface of the spacer in cross-sectional view.
  • the bent portion of the current collecting tab comes into contact with the spacer, it becomes easier to more effectively absorb the impact that may occur between the electrode assembly 200 and the spacer 4.
  • the current collecting tab 6 has a portion K 1 which forms a bent shape.
  • the bent-shaped portion K 1 is in contact with the spacer 4.
  • the current collecting tab may be in contact with the spacer as well as the separator between the electrode assembly and the spacer. That is, for example, as shown in FIG. 4, the current collecting tab protruding laterally from the electrode assembly is in contact with both the spacer and the separator while meandering due to the bent shape. This makes it easier to absorb the impact that may occur between the electrode assembly 200 and the spacer 4, while considering the compactness of the secondary battery.
  • the current collecting tab is provided with at least two bent portions, one bent portion of the current collecting tab is in contact with the spacer, and the other bent portion of the current collecting tab is in contact with the separator. ing.
  • each or one of the positive electrode current collecting tab and the negative electrode current collecting tab it extends so as to meander due to the bending shape, and at least one of the two bending portions forming the meandering is in contact with the spacer. , The other is in contact with the separator.
  • the electrode assembly has a separator extending portion extending outward from the positive electrode and the negative electrode at the end face on which the current collecting tab protrudes, and forms a bent shape of the current collecting tab. Is in contact with the extending part of the separator.
  • the separator extending portion extends outward from the positive electrode layer and the negative electrode layer, particularly in a direction orthogonal to the stacking direction of the electrode assembly. It can be said that the portion where the separator extends beyond the ends of the electrode layers of the positive electrode layer and the negative electrode layer corresponds to the separator extending portion. In the exemplary embodiment shown in FIG.
  • the electrode assembly 200 has a separator extending portion 30 extending so that the separator 3 protrudes from the positive electrode 1 and the negative electrode 2 at the end surface 200'where the current collecting tab 6 projects.
  • the bent portion K 2 of the current collecting tab 6 is in contact with the separator extending portion 30.
  • the folded-back portion of the bent-shaped portion may be in contact with the separator extending portion 30.
  • the separator extending portion 30 may have a structure in which a plurality of separators 3 are focused on each other (see FIGS. 4, 5 and 6A to 6D). Alternatively, the separator extending portion 30 may not have such focusing (see FIG. 6E), and the end of the separator extending portion 30 may be in contact with the bent portion of the current collecting tab. In the embodiment shown in FIG. 6E, the current collecting tab protruding from the electrode assembly extends so as to meander in the separation space between the electrode assembly (particularly the electrode assembly considered by removing the separator) and the spacer. ..
  • the bent-shaped portions K 1 and K 2 of the current collecting tab 6 are in contact with the spacer 4 and the separator extending portion 30, respectively (see FIG. 4 and the like).
  • the current collecting tab 6 can form a fulcrum so as to be sandwiched between the electrode assembly 200 and the spacer 4.
  • the elasticity of the current collecting tab 6 can be particularly improved, and the impact that may occur between the electrode assembly 200 and the spacer 4 can be further absorbed.
  • the spacer may have an opening or recess for the current collecting tab.
  • the current collecting tab 6 can be extended from one side (that is, the electrode assembly 200 side) to the other side (that is, the exterior body 300 side) of the spacer 4 (see FIG. 4). That is, the current collecting tab 6 can be extended so as to straddle the spacer 4 through such an opening or a recess.
  • the current collecting tab meanders and extends in contact with the separator and spacer of the electrode assembly in the separation space between the electrode assembly and the spacer, and is further outside beyond the spacer. May be extended to. Such a form contributes to the compactification of the secondary battery and / or the prevention of interference between the current collecting tab and other battery components.
  • the current collecting tab extends from the surface on the electrode assembly side to the surface on the exterior body side so as to straddle both sides of the main surface of the spacer.
  • the current collecting tab 6 extends from the surface on the electrode assembly 200 side to the surface on the exterior body 300 side so as to straddle the main surface of the spacer 4.
  • the current collecting tabs may extend so as to be in contact with both opposing main surfaces of the spacer 4.
  • "extending so as to straddle both sides of the main surface of the spacer” means that the spacer extends at least 1/4 or more of the cross-sectional view dimension of the spacer 4 in the cross-sectional view of the secondary battery 400.
  • the current collecting tab and the spacer can be more preferably interfered with each other. Therefore, it becomes easy to prevent the spacer 4 from moving, and it becomes easy to reduce the impact that may occur between the electrode assembly 200 and the spacer 4.
  • the electrode assembly 200 is a wound electrode assembly in which a positive electrode, a negative electrode, and a separator are wound (see FIG. 1B).
  • the separator extending portion 30 can have a structure focused toward the winding axis (see FIG. 4 and the like). Further, by laminating each separator 3 via a hollow portion (for example, an air layer), the separator extending portion 30 can provide cushioning property. This also makes it easier for the separator extending portion 30 to absorb the impact that may occur between the electrode assembly 200 and the spacer 4.
  • At least a part of the separator extending portion 30 has a bent shape that is convex toward the outer peripheral side of the winding (see FIG. 4 and the like). More specifically, at least a portion of the separator extending portion 30 has a portion K 3 forming a convex bent shape to the outer peripheral side of the wound. As a result, more hollow portions can be interposed between the separators 3, and the separator extending portion 30 can be particularly cushioned.
  • the "bent shape convex to the outer peripheral side” refers to a bent shape protruding from the inner peripheral side in the winding direction toward the outer peripheral side in a cross-sectional view.
  • the electrode assembly 200 has a converging portion 30B of the separator extending portion 30 is formed by focusing the portion K 2 forming the bent shape of the current collector tab 6 is in contact with the converging portion 30B (See FIG. 6F).
  • the "focusing portion 30B" is a portion in which the separator 3 is focused toward the winding axis of the electrode assembly 200, and is positioned at the center of the end face 200'of the electrode assembly 200. Since the fulcrum is formed in the central portion of the electrode assembly by contacting the bent portion with the focusing portion, the structural stability between the battery components can be further enhanced.
  • an insulating material is provided at least in a bent shape of the current collecting tab.
  • the elasticity of the current collecting tab is improved by the elasticity of the insulating material, and the impact can be absorbed more.
  • the insulation between the current collecting tab, the electrode assembly and the exterior body can be further improved.
  • an insulating material member particularly, an insulating material member forming a layer together with the tab
  • Insulating materials include, for example, insulating polymer materials such as polyester (eg, polyethylene terephthalate), polyimide, polyamide, polyamideimide, and / or polyolefin (eg, polyethylene and / or polypropylene). From the viewpoint of providing a more intended bent shape, the insulating material is preferably made of polypropylene.
  • polyester eg, polyethylene terephthalate
  • polyimide polyamide
  • polyamideimide polyamideimide
  • polyolefin eg, polyethylene and / or polypropylene
  • one of the main surfaces of the spacer is in contact with the electrode terminal structure of the exterior body. More specifically, in a cross-sectional view of the secondary battery 400, the exterior body 300 is provided with the electrode terminal structure 5', and the spacer 4 is in contact with the rivet portion 50 in the electrode terminal structure 5'(or , Attached to the rivet portion 50) (see FIG. 7). With such a configuration, it is possible to provide a space in which the current collecting tab can extend between the spacer 4 and the exterior body 300 while preventing the spacer 4 and the exterior body 300 from being displaced from each other.
  • the spacer 4 may have an adhesive layer, and the adhesive layer and the exterior body 300 may be in contact with each other (see FIG. 7). When the spacer 4 comes into contact with the exterior body 300 via the adhesive layer, it is possible to particularly prevent the spacer 4 and the exterior body 300 from being displaced from each other.
  • the exterior body further comprises an electrode terminal structure of either a positive electrode terminal or a negative electrode terminal, and a part of the current collecting tab is positioned between the spacer and the electrode terminal structure. ..
  • the adhesive layer provided on the main surface of the spacer 4 on the outer body 300 side is in contact with the rivet portion 50 of the electrode terminal structure 5'(see FIG. 7).
  • the electrode terminal structure 5 '(i.e., the positive terminal 5 1) is attached to the inner terminal 51 (see FIGS. 4 and 7) ..
  • one end extending to the exterior body 300 side of the negative electrode current collector tab 62 is attached to a position corresponding to the negative terminal 5 and second inner outer body 300 (see FIG. 5).
  • the length dimension of the current collecting tab is 1 mm or more and 30 mm or less.
  • the "length dimension" here refers to the length when the current collector tab is extended straight.
  • a bent shape particularly, a plurality of bent shapes
  • the current collecting tab can be made more elastic.
  • the length dimension is 30 mm or less
  • the length dimension of the current collecting tab is preferably 2 mm or more and 20 mm or less, for example, 5 mm or more and 10 mm or less.
  • the width dimension of the current collecting tab is 100 ⁇ m or more and 10 mm or less.
  • the width dimension is 100 ⁇ m or more, the current collecting tab can be made more elastic and rigid.
  • the width dimension is 10 mm or less, the secondary battery can be made more compact.
  • the handleability of the current collecting tab can be further improved.
  • the width dimension of the current collector tab is preferably 300 ⁇ m or more and 5 mm or less, for example, 500 ⁇ m or more and 2.5 mm or less.
  • the thickness dimension of the current collecting tab is 10 ⁇ m or more and 3 mm or less.
  • the thickness dimension is 10 ⁇ m or more, the current collecting tab can be made more elastic and rigid.
  • the thickness dimension is 3 mm or less, the secondary battery can be made more compact.
  • the handleability of the current collecting tab can be further improved.
  • the thickness dimension of the current collector tab is preferably 50 ⁇ m or more and 2 mm or less, for example, 70 ⁇ m or more and 1 mm or less.
  • the parameters related to the shape of the current collecting tab described above are the dimensions measured using a micrometer (Mitutoyo model number MDH-25MB) or a height gauge, or the dimensions thereof. You may point to the value calculated from.
  • the Young's modulus of the current collecting tab is 50 GPa or more and 300 GPa or less. When the Young's modulus is within such a range, the elasticity and rigidity can be made excellent while maintaining the handleability of the current collecting tab.
  • the Young's modulus of the current collector tab is preferably 60 GPa or more and 250 GPa or less, for example, 70 GPa or more and 200 GPa or less.
  • the Young's modulus of the current collecting tab described above may refer to a value measured by a method according to the JIS standard (JIS R 1602).
  • a desktop precision universal testing machine manufactured by Shimadzu Corporation, model number AGS-5kNX may be used for measuring Young's modulus.
  • the tensile strength of the current collecting tab is 50 N / mm 2 or more and 1000 N / mm 2 or less. When the tensile strength is within such a range, the current collecting tab can be made more difficult to break while maintaining the handleability of the current collecting tab.
  • the tensile strength of the current collector tabs it is 80 N / mm 2 or more 800 N / mm 2 or less is preferable, for example, 100 N / mm 2 or more 600N / mm 2 or less.
  • the tensile strength of the current collecting tab may refer to a value measured by a method according to the JIS standard (JIS Z 2241).
  • the current collector tab comprises at least one selected from the group consisting of stainless steel, aluminum, nickel and copper. With such a configuration, it can be made more excellent in conductivity and elasticity.
  • the secondary battery according to the present invention can be manufactured by a manufacturing method including the following steps. That is, the method for manufacturing a secondary battery according to the present invention is a step of laminating or winding a positive electrode, a negative electrode and a separator arranged between the positive electrode and the negative electrode to obtain a precursor of an electrode assembly (electrode assembly). Step), and a step of forming a current collecting tab so as to form a bent shape between the electrode assembly and the spacer while accommodating the electrode assembly and the spacer in the exterior body, and injecting an electrolyte into the exterior body (accommodation step). )including.
  • the positive electrode 1, the negative electrode 2, and the rectangular separator 3 are arranged in a predetermined order and laminated or wound to obtain a precursor of the electrode assembly.
  • the precursor of the electrode assembly may be a plane laminated electrode assembly 200 (see FIG. 1A) in which a positive electrode 1, a negative electrode 2 and a separator 3 are laminated in the thickness direction.
  • the precursor of the electrode assembly may be a wound electrode assembly 200 (see FIG. 1B) by winding the positive electrode 1, the negative electrode 2, and the separator 3. The assembly process of the wound electrode assembly will be described below.
  • the separators 3 having a shape are arranged in a predetermined order and wound around (see FIG. 9B). At the time of winding, by applying a predetermined tension to the separator 3, the separator 3 is focused toward the winding shaft P toward the tip of the separator extending portion (or approaches each other) as a precursor of the electrode assembly. The body is obtained.
  • the tension applied to the separator 3 at the time of winding is usually 0.1 N or more and 10 N or less, and preferably 0.5 N or more and 3.0 N or less from the viewpoint of focusing.
  • the dimensions of the separator 3 used are not particularly limited as long as the desired electrode assembly can be obtained.
  • the length dimension w1 in the width direction r of the separator 3 is usually preferably 105% or more and 400% or less, for example, 120% or more and 200% with respect to the length in the winding axis direction of the positive electrode 1 or the negative electrode. It is as follows (see FIG. 8). Further, for example, the length dimension w2 in the longitudinal direction s of the separator 3 may be appropriately determined according to the dimension of the target secondary battery (particularly, the number of turns of the electrode assembly).
  • the precursor of the wound electrode assembly may be formed into a substantially flat column shape by pressing in the diameter direction of the wound body, if desired.
  • a portion K in which the current collecting tab 6 (that is, the positive electrode current collecting tab 61 and the negative electrode current collecting tab 62) forms a bent shape that bends from the spacer 4 toward the electrode assembly 200. 1, and the electrode assembly 200 so as to form a portion K 2 forming the bent shape to bend toward the spacer 4, then trimmed to shape and advance provisional bend the collector tab 6, thereby cross the spacers 4 respectively.
  • the electrode assembly 200 and the spacer 4 are housed in the exterior body main body 310 (see FIG. 2).
  • an adhesive layer (not shown) provided on the main surface of the spacer 4 on the outer body 300 side is attached to the rivet portion 50 of the electrode terminal structure 5'(see FIG. 7).
  • fusing the inner terminal 51 of the exterior body 300 electrode terminal structure one end extending side 5 of the positive electrode current collector tab 61 '(i.e., the positive terminal 5 1) (see FIG. 4).
  • one end extending to the exterior body 300 side of the negative electrode current collector tab 62 is welded at a position corresponding to the negative terminal 5 and second inner outer body 300 (see FIG. 5).
  • the exterior body body 310 and the exterior body lid 320 are welded together (see FIG. 2).
  • the electrolyte may be injected from the injection port 7 and the injection port 7 may be closed with a sealing plug (not shown). Welding may be achieved by any method known in the field of secondary batteries, for example laser irradiation may be used.
  • the secondary battery according to the present invention can be used in various fields where storage is expected.
  • secondary batteries are used in the fields of electricity, information, and communication (for example, mobile phones, smartphones, laptop computers and digital cameras, activity meters, arm computers, and electronic papers) in which electric and electronic devices are used.
  • RFID tags card-type electronic money, electric / electronic equipment fields including small electronic devices such as smart watches or mobile equipment fields), home / small industrial applications (for example, electric tools, golf carts, home / nursing care / Industrial robots), large industrial applications (eg forklifts, elevators, bay port cranes), transportation systems (eg hybrids, electric vehicles, buses, trains, electric assisted bicycles, electric motorcycles, etc.) , Electric power system applications (for example, various power generation, road conditioners, smart grids, general household installation type power storage systems, etc.), medical applications (medical equipment fields such as earphone hearing aids), pharmaceutical applications (fields such as dose management systems) , Also, it can be used in the IoT field, space / deep sea applications (for example, fields such as space explorers and submersible research vessels).
  • IoT field space / deep sea applications (for example, fields such as space explorers and submersible research vessels).
  • the secondary battery according to the present invention can prevent a short circuit that may occur especially when an impact or heat is applied to the battery. Therefore, the secondary battery according to the present invention can be particularly preferably used for mobile device applications where impact or heat can be applied from all directions.
  • Electrode terminal 5 1 positive electrode terminal 5 2: negative electrode terminal 5 ': electrode terminal structure 50: rivet 51: inner terminal 52: gasket 6: electrode tabs 61: positive electrode current collector tab 62: negative electrode current collector tab 63: insulating material 7 : Electrode injection port 8: Opening 100: Electrode constituent unit 200: Electrode assembly 200': End face on which the current collecting tab protrudes 300: Exterior body 310: Exterior body body 320: Exterior body lid 400: Secondary battery

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  • Electrochemistry (AREA)
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Abstract

L'invention concerne une batterie secondaire : qui comprend un ensemble d'électrodes comprenant une électrode positive, une électrode négative et un séparateur disposé entre celles-ci ; et dans lequel un électrolyte est scellé dans un emballage externe. Cette batterie secondaire comprend un élément d'espacement positionné entre l'ensemble d'électrodes et l'emballage externe. L'ensemble d'électrodes est formé en raison d'une électrode positive et de languettes de collecteur de courant d'électrode négative qui font saillie à partir de la même surface d'extrémité de l'ensemble d'électrodes. L'élément d'espacement est positionné entre l'emballage externe et la surface d'extrémité d'ensemble d'électrodes à partir de laquelle les languettes de collecteur de courant font saillie, et en conséquence, l'électrode positive et/ou la languette de collecteur de courant d'électrode négative ont une forme courbée entre l'ensemble d'électrodes et l'élément d'espacement.
PCT/JP2020/016960 2019-04-25 2020-04-17 Batterie secondaire WO2020218217A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202080030896.1A CN113711406A (zh) 2019-04-25 2020-04-17 二次电池
JP2021516089A JP7215570B2 (ja) 2019-04-25 2020-04-17 二次電池
US17/506,792 US20220045407A1 (en) 2019-04-25 2021-10-21 Secondary battery

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